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-rw-r--r--tvix/eval/src/systems.rs351
1 files changed, 351 insertions, 0 deletions
diff --git a/tvix/eval/src/systems.rs b/tvix/eval/src/systems.rs
new file mode 100644
index 000000000000..16386cb9e0ad
--- /dev/null
+++ b/tvix/eval/src/systems.rs
@@ -0,0 +1,351 @@
+/// true iff the argument is recognized by cppnix as the second
+/// coordinate of a "nix double"
+fn is_second_coordinate(x: &str) -> bool {
+    matches!(x, "linux" | "darwin" | "netbsd" | "openbsd" | "freebsd")
+}
+
+/// This function takes an llvm triple (which may have three or four
+/// components, separated by dashes) and returns the "best"
+/// approximation as a nix double, where "best" is currently defined
+/// as "however cppnix handles it".
+pub fn llvm_triple_to_nix_double(llvm_triple: &str) -> String {
+    let parts: Vec<&str> = llvm_triple.split('-').collect();
+    let cpu = match parts[0] {
+        "armv6" => "armv6l", // cppnix appends an "l" to armv6
+        "armv7" => "armv7l", // cppnix appends an "l" to armv7
+        x => match x.as_bytes() {
+            [b'i', _, b'8', b'6'] => "i686", // cppnix glob-matches against i*86
+            _ => x,
+        },
+    };
+    let os = match parts[1..] {
+        [_vendor, kernel, _environment] if is_second_coordinate(kernel) => kernel,
+        [_vendor, kernel] if is_second_coordinate(kernel) => kernel,
+        [kernel, _environment] if is_second_coordinate(kernel) => kernel,
+
+        // Rustc uses wasm32-unknown-unknown, which is rejected by
+        // config.sub, for wasm-in-the-browser environments.  Rustc
+        // should be using wasm32-unknown-none, which config.sub
+        // accepts.  Hopefully the rustc people will change their
+        // triple before stabilising this triple.  In the meantime,
+        // we fix it here in order to unbreak tvixbolt.
+        //
+        // https://doc.rust-lang.org/beta/nightly-rustc/rustc_target/spec/wasm32_unknown_unknown/index.html
+        ["unknown", "unknown"] if cpu == "wasm32" => "none",
+
+        _ => panic!("unrecognized triple {llvm_triple}"),
+    };
+    format!("{cpu}-{os}")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_systems() {
+        assert_eq!(
+            llvm_triple_to_nix_double("aarch64-unknown-linux-gnu"),
+            "aarch64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("i686-unknown-linux-gnu"),
+            "i686-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("x86_64-apple-darwin"),
+            "x86_64-darwin"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("x86_64-unknown-linux-gnu"),
+            "x86_64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("aarch64-apple-darwin"),
+            "aarch64-darwin"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("aarch64-unknown-linux-musl"),
+            "aarch64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("arm-unknown-linux-gnueabi"),
+            "arm-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("arm-unknown-linux-gnueabihf"),
+            "arm-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv7-unknown-linux-gnueabihf"),
+            "armv7l-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips-unknown-linux-gnu"),
+            "mips-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips64-unknown-linux-gnuabi64"),
+            "mips64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips64-unknown-linux-gnuabin32"),
+            "mips64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips64el-unknown-linux-gnuabi64"),
+            "mips64el-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips64el-unknown-linux-gnuabin32"),
+            "mips64el-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mipsel-unknown-linux-gnu"),
+            "mipsel-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("powerpc-unknown-linux-gnu"),
+            "powerpc-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("powerpc64-unknown-linux-gnu"),
+            "powerpc64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("powerpc64le-unknown-linux-gnu"),
+            "powerpc64le-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("s390x-unknown-linux-gnu"),
+            "s390x-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("x86_64-unknown-linux-musl"),
+            "x86_64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("x86_64-unknown-netbsd"),
+            "x86_64-netbsd"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("aarch64-linux-android"),
+            "aarch64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("arm-linux-androideabi"),
+            "arm-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("arm-unknown-linux-musleabi"),
+            "arm-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("arm-unknown-linux-musleabihf"),
+            "arm-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv5te-unknown-linux-gnueabi"),
+            "armv5te-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv5te-unknown-linux-musleabi"),
+            "armv5te-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv7-linux-androideabi"),
+            "armv7l-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv7-unknown-linux-gnueabi"),
+            "armv7l-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv7-unknown-linux-musleabi"),
+            "armv7l-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv7-unknown-linux-musleabihf"),
+            "armv7l-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("i586-unknown-linux-gnu"),
+            "i686-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("i586-unknown-linux-musl"),
+            "i686-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("i686-linux-android"),
+            "i686-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("i686-unknown-linux-musl"),
+            "i686-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips-unknown-linux-musl"),
+            "mips-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips64-unknown-linux-muslabi64"),
+            "mips64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips64el-unknown-linux-muslabi64"),
+            "mips64el-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mipsel-unknown-linux-musl"),
+            "mipsel-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("sparc64-unknown-linux-gnu"),
+            "sparc64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("thumbv7neon-linux-androideabi"),
+            "thumbv7neon-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("thumbv7neon-unknown-linux-gnueabihf"),
+            "thumbv7neon-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("x86_64-linux-android"),
+            "x86_64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("x86_64-unknown-linux-gnux32"),
+            "x86_64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("aarch64-unknown-linux-gnu_ilp32"),
+            "aarch64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("aarch64-unknown-netbsd"),
+            "aarch64-netbsd"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("aarch64_be-unknown-linux-gnu_ilp32"),
+            "aarch64_be-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("aarch64_be-unknown-linux-gnu"),
+            "aarch64_be-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armeb-unknown-linux-gnueabi"),
+            "armeb-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv4t-unknown-linux-gnueabi"),
+            "armv4t-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv6-unknown-netbsd-eabihf"),
+            "armv6l-netbsd"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv7-unknown-linux-uclibceabi"),
+            "armv7l-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv7-unknown-linux-uclibceabihf"),
+            "armv7l-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("armv7-unknown-netbsd-eabihf"),
+            "armv7l-netbsd"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("hexagon-unknown-linux-musl"),
+            "hexagon-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("i686-unknown-netbsd"),
+            "i686-netbsd"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("m68k-unknown-linux-gnu"),
+            "m68k-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips-unknown-linux-uclibc"),
+            "mips-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mips64-openwrt-linux-musl"),
+            "mips64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mipsel-unknown-linux-uclibc"),
+            "mipsel-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mipsisa32r6-unknown-linux-gnu"),
+            "mipsisa32r6-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mipsisa32r6el-unknown-linux-gnu"),
+            "mipsisa32r6el-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mipsisa64r6-unknown-linux-gnuabi64"),
+            "mipsisa64r6-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("mipsisa64r6el-unknown-linux-gnuabi64"),
+            "mipsisa64r6el-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("powerpc-unknown-linux-gnuspe"),
+            "powerpc-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("powerpc-unknown-linux-musl"),
+            "powerpc-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("powerpc-unknown-netbsd"),
+            "powerpc-netbsd"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("powerpc64-unknown-linux-musl"),
+            "powerpc64-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("powerpc64le-unknown-linux-musl"),
+            "powerpc64le-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("riscv32gc-unknown-linux-gnu"),
+            "riscv32gc-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("riscv32gc-unknown-linux-musl"),
+            "riscv32gc-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("riscv64gc-unknown-linux-musl"),
+            "riscv64gc-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("s390x-unknown-linux-musl"),
+            "s390x-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("sparc-unknown-linux-gnu"),
+            "sparc-linux"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("sparc64-unknown-netbsd"),
+            "sparc64-netbsd"
+        );
+        assert_eq!(
+            llvm_triple_to_nix_double("thumbv7neon-unknown-linux-musleabihf"),
+            "thumbv7neon-linux"
+        );
+    }
+}